Therefore it is permissible
to call your son ‘Abd al-Ahad or ‘Abd al-Samad.

Shaykh ‘Abd al-Rahmaan al-Barraak.

The meaning of al-Ahad
is the Unique, who is forever One and has never and will never have
another alongside Him. (al-Nihaayah,
1/35).

Allaah is Unique in
His Oneness, in being One in His essence and attributes. Some (scholars)
differentiated between al-Waahid and
al-Ahad by saying that al-Waahid refers to His being one in His essence
only, whilst al-Ahad means that He is one in both His essence and His
attributes. (Tafseer Asmaa’
Allaah by al-Zajjaaj, p. 58).

And it was said that
al-Waahid means He is unique in His essence and does not have any peer
or rival, and al-Ahad is Unique in His attributes. So al-Waahid is one
in and of Himself, and al-Ahad means being one in His attributes. Al-Ahad
is one of the attributes of Allaah which belong uniquely to Him, and
in which nothing else has a share. (Lisaan al-‘Arab
–Ahad – 1/35; wahida
8/4779 – 4783). Allaah is al-Waahid al-Ahad, and has no second,
no partner, no peer and no rival. He is al-Waahid upon Whom His slaves
depend and Whom they seek. They do not put their trust in anyone except
Him. (Ishtiqaaq
Asmaa’ Allaah, 90-93). He is al-Waahid and there is
none like unto Him. Everything other than Him that is called one in
some aspect will not be one in many other aspects. (Sha’n al-Du’aa’,
82-83)

Ibn Jareer believed
that the Oneness of Allaah ruled out there being anything else that
could be like Him. Allaah has no peer and no rival. He is the One God,
the One Lord, and no one other than Him deserves to be obeyed; no one
other than Him should beworshipped. (Tafseer Ibn
Jareer, 3/265-266)

And Allaah says (interpretation
of the meaning):

“And
your Ilaah (God) is One Ilaah (God — Allaah)” [al-Baqarah 2:163]

Allaah is One and is Perfect in all
ways; He has no partner or associate. His slaves must affirm His Oneness
in their hearts and in their words and deeds, by acknowledging His absolute
perfection and directing all acts of worship solely to Him. (Tayseer
al-Kareem al-Rahmaan, 5/485)